<!DOCTYPE html>
<html lang='en'>

<head>
  <meta charset='UTF-8'>
  <meta name='viewport' content='width=device-width, initial-scale=1.0'>
  <title></title>
  <script type='text/javascript' src='js/vue.js'></script>
  <style type="text/css">
    .container {}

    .container .cart {
      width: 300px;
      /*background-color: lightgreen;*/
      margin: auto;
    }

    .container .title {
      background-color: lightblue;
      height: 40px;
      line-height: 40px;
      text-align: center;
      /*color: #fff;*/
    }

    .container .total {
      background-color: #FFCE46;
      height: 50px;
      line-height: 50px;
      text-align: right;
    }

    .container .total button {
      margin: 0 10px;
      background-color: #DC4C40;
      height: 35px;
      width: 80px;
      border: 0;
    }

    .container .total span {
      color: red;
      font-weight: bold;
    }

    .container .item {
      height: 55px;
      line-height: 55px;
      position: relative;
      border-top: 1px solid #ADD8E6;
    }

    .container .item img {
      width: 45px;
      height: 45px;
      margin: 5px;
    }

    .container .item .name {
      position: absolute;
      width: 90px;
      top: 0;
      left: 55px;
      font-size: 16px;
    }

    .container .item .change {
      width: 100px;
      position: absolute;
      top: 0;
      right: 50px;
    }

    .container .item .change a {
      font-size: 20px;
      width: 30px;
      text-decoration: none;
      background-color: lightgray;
      vertical-align: middle;
    }

    .container .item .change .num {
      width: 40px;
      height: 25px;
    }

    .container .item .del {
      position: absolute;
      top: 0;
      right: 0px;
      width: 40px;
      text-align: center;
      font-size: 40px;
      cursor: pointer;
      color: red;
    }

    .container .item .del:hover {
      background-color: orange;
    }
  </style>
</head>

<body>
  <div id="app">
    <my-cart></my-cart>
  </div>
  <script type='text/javascript'>
    let cartTitle = {
      props: ['uname'],
      template: `
        <div class="title">{{ uname }}的商品</div>
      `,
    }
    let cartList = {
      props: ['list'],
      template: `
        <div>
          <div class="item" v-for="item in list" :key="item.id">
            <img :src="item.img"/>
            <div class="name">{{item.name}}</div>
            <div class="change">
              <a href="" @click.prevent=sub(item.id)>－</a>
              <input type="text" class="num" :value="item.num" @blur="changeNum(item.id, $event)" />
              <a href="" @click.prevent=add(item.id)>＋</a>
            </div>
            <div class="del" @click="del(item.id)">×</div>
          </div>
        </div>
      `,
      methods: {
        changeNum(id, event) {
          this.$emit('changeNum', {
            id,
            num: event.target.value,
            type: 'change'
          })
        },
        sub(id){
          this.$emit('changeNum', {
            id,
            type: 'sub'
          })
        },
        add(id){
          this.$emit('changeNum', {
            id,
            type: 'add'
          })
        },
        del(id){
          this.$emit('cart-del', id)
        }
      },
    }
    let cartTotal = {
      props: ['list'],
      template: `
        <div class="total">
          <span>总价：{{ total }}</span>
          <button>结算</button>
        </div>
      `,
      computed: {
        total() {
          let total = 0
          this.list.forEach(item => {
            total += Number(item.num * item.price)
          });
          return total
        }
      },
    }
    Vue.component('my-cart', {
      data() {
        return {
          uname: '皮卡丘用户',
          list: [{
            id: 1,
            name: 'TCL彩电',
            price: 1000,
            num: 1,
            img: 'img/a.jpg'
          }, {
            id: 2,
            name: '机顶盒',
            price: 1000,
            num: 1,
            img: 'img/b.jpg'
          }, {
            id: 3,
            name: '海尔冰箱',
            price: 1000,
            num: 1,
            img: 'img/c.jpg'
          }, {
            id: 4,
            name: '小米手机',
            price: 1000,
            num: 1,
            img: 'img/d.jpg'
          }, {
            id: 5,
            name: 'PPTV电视',
            price: 1000,
            num: 2,
            img: 'img/e.jpg'
          }]
        }
      },
      template: `
        <div class="container">
          <div class="cart">
            <cart-title :uname="uname"></cart-title>
            <cart-list :list="list" @changeNum="numChange" @cart-del="delCart"></cart-list>
            <cart-total :list="list"></cart-total>
          </div>
        </div>
      `,
      components: {
        "cart-title": cartTitle,
        "cart-list": cartList,
        "cart-total": cartTotal
      },
      methods: {
        numChange(val) {
          if (val.type == 'change') {
            this.list.some(item => {
              if(item.id == val.id) {
                item.num = val.num
                return true
              }
            })
          }else if(val.type == 'sub') {
            this.list.some(item => {
              if(item.id == val.id) {
                item.num -= 1
                return true
              }
            })
          }else if(val.type == 'add') {
            this.list.some(item => {
              if(item.id == val.id) {
                item.num += 1
                return true
              }
            })
          }
        },
        delCart(id){
          let index = this.list.findIndex(item=>{
            if(item.id == id) {
              return true
            }
          })
          this.list.splice(index, 1)
        }
      }
    })
    var vm = new Vue({
      el: '#app',
      data: {

      },
      methods: {

      }
    });
  </script>
</body>

</html>